Add model cards for DeepPavlov models (#3138)

* add empty model cards for every current DeepPavlov model

* fix: replace cyrillic `с` with `c`

* docs: add model cards for current DeepPavlov BERT models

* docs: add links for arXiv preprints

model_cards/DeepPavlov/bert-base-cased-conversational/README.md

@@ -0,0 +1,23 @@
+---
+language:
+- english
+---
+
+# bert-base-cased-conversational
+
+Conversational BERT \(English, cased, 12-layer, 768-hidden, 12-heads, 110M parameters\) was trained
+on the English part of Twitter, Reddit, DailyDialogues\[1\], OpenSubtitles\[2\], Debates\[3\], Blogs\[4\],
+Facebook News Comments. We used this training data to build the vocabulary of English subtokens and took
+English cased version of BERT-base as an initialization for English Conversational BERT.
+
+
+\[1\]: Yanran Li, Hui Su, Xiaoyu Shen, Wenjie Li, Ziqiang Cao, and Shuzi Niu. DailyDialog: A Manually Labelled
+Multi-turn Dialogue Dataset. IJCNLP 2017.
+
+\[2\]: P. Lison and J. Tiedemann, 2016, OpenSubtitles2016: Extracting Large Parallel Corpora from Movie and TV Subtitles.
+In Proceedings of the 10th International Conference on Language Resources and Evaluation \(LREC 2016\)
+
+\[3\]: Justine Zhang, Ravi Kumar, Sujith Ravi, Cristian Danescu-Niculescu-Mizil. Proceedings of NAACL, 2016.
+
+\[4\]: J. Schler, M. Koppel, S. Argamon and J. Pennebaker \(2006\). Effects of Age and Gender on Blogging
+in Proceedings of 2006 AAAI Spring Symposium on Computational Approaches for Analyzing Weblogs.